Battery Charging? W850i R1KG001 RED52

Dears,

I don't know if this is normal or not, but when I charge my phone sometimes it takes hours and the phone does not show Fully Charged message.

When I go to Phone Status it shows Charging: 100% and when I unplug the charger cable and replug it again it restarts charging.

Honestly I don't remember, but I think I was getting a Fully Charged message before flashing my phone to R1KG001.

And the battery icon remains same all the time as green with a lightening on it while the cable is plugged.